2. 财经
  3. Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase urb

Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase urb

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问题     Water problems in the future will become more intense and more complex. Our increasing population will tremendously increase urban wastes, primarily sewage. On the other hand, increasing demands for water will decrease substantially the amount of water available for diluting wastes. Rapidly expanding industries which involve more and more complex chemical processes will produce large volumes of liquid wastes, and many of these will contain chemicals which are poisonous. To feed our rapidly expanding population, agriculture will have to be intensified. This will involve ever-increasing quantities of agriculture chemicals. From this, it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problem.
    There are two ways by which this pollution problem can be lessened. The first relates to the treatment of wastes to decrease their pollution hazard. This involves the processing of solid wastes prior to disposal and the treatment of liquid wastes, or effluents, to permit the reuse of the water or best reduce pollution upon final disposal.
    A second approach is to develop an economic use for all or a part of the wastes. Farm manure is spread in fields as a nutrient or organic supplement. Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained. Effluents from other processing plants may also be used as a supplemental source of water. Many industries, such as meat and poultry processing plants, are currently converting former waste production into marketable byproducts. Other industries have potential economic uses for their waste products.
The author gives substance to the passage through the use of______.
选项 A、interviews with authorities in the field of water controls
B、opinion and personal observations
C、definitions which clarify important terms
D、strong argument and persuasion
答案B
解析 通过浏览整篇文章以及对段落首末句的分析可知，作者是在发表自己的个人观点并分层次具体阐述。所以B项正确。
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